Las Vegas has been making much of its superior qualities as a convention city - the place Republicans should hold their 2016 convention. But now a liberal pressure group is throwing a damper over those plans. American Bridge, a group that says it tries to keep Republicans accountable, is promising to follow delegates all over town to snap pictures of them in compromising places. This breaches an old rule about visiting Las Vegas, but what impact could it have on the choice of a convention city? Is Las Vegas too sinful for its own good? And what might happen to a Republican candidate if he or she were caught making the most of Sin City?